CeilAir DX Series Betreibershandbuch PDF herunterladen (Seite 22)

(Mar, 2012)

CeilAiR OHS Series Installation, Operation & Maintenance Manual

ir Technology Systems, Inc.

2-11

disconnect switch to the surface of the unit. If the

factory installed, non-fused service switch option was

purchased, the main power and ground connection

shall be located at the non-fused service switch,

otherwise, the main power connection shall be

located as stated below.

Each unit is provided with pilot hole(s) in the main

power and control panel for connection of the ﬁ eld-

wiring. These pilot holes are located near the electri-

cal box and a label stating “MAIN POWER INPUT”

is in close proximity. Terminate the main power wires

at the line side of the main power distribution block

located within the electric box. A separate equipment

ground lug is provided within the electrical box for

termination of the earth ground wire.

2.7.1.1 Single-Phase Units 208/230V

Units that are designed for a 208V-supply voltage

must have a tolerance that is within -5% and +10%.

If the measured supply voltage is 230V, the unit

can operate with a tolerance of ±5% if the following

change is performed. The control transformers within

the system must have the primary wire connected to

its respective 240V tap instead of the 208V tap.

2.7.1.2 Single-Phase Units 277V

Single-phase units require that the hot leg of power

be connected to terminal L1 and the neutral wire to

terminal L2 of the main power distribution block.

2.7.1.3 Single-Phase Units (208/230V) with

277/230V Buck/Boost Transformer

Applications (See Figure 6)

Certain applications may require the purchase of a

unit designed for a 208V, 1PH, 60Hz power supply

and supplied with a 277V/230V buck/boost trans-

former. This conﬁ guration allows the equipment to

operate from a customer supplied 277V, 1PH, 60Hz

power supply. The purpose of the buck/boost trans-

former is to convert the incoming 277V, 1PH, 60Hz

power supply to the required 230V, 1PH, 60Hz power

supply for unit operation. If the incoming power sup-

ply is within the range of 277V plus 5%, the control

transformers within the system must have the primary

wire connected to its respective 240V tap instead of

the 208V tap.

NOTE

Prior to operation, an adequate unit-to-earth

earth ground must be connected to the unit

Figure 6- Transformer Schematic

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 59 60

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